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I tried to upgrade the RAM on my desktop, but it fails to boot.

The motherboard (ASUS M3A78-T) supports ECC RAM,

To build a home server, I bought 4 of the following:

Hynix HYMP125P72CP4-S5 AB (2GB, DDR2-800Mhz, 1Rx4, PC2-6400P) Brand details: HP (499276-061) 501157-001 ECC REG

I matched everything I read was important: the DDR generation, the clock speed and the maximum slot capacity.

...Can anyone tell me why the upgrade failed? Does anything not match the motherboard?

From the motherboard manual:

1.7.2 Memory Configurations You may install 256MB, 512MB, 1GB, and 2GB unbuffered ECC/non-ECC DDR2 DIMMs into the DIMM sockets.

Also: A list of approved 800Mhz RAM from the manual (below)

Thank you

List of approved 800Mhz RAM from the manual

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Your RAM is registered and the specifications for your motherboard require unbuffered DIMMs.

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  • Thank you. I had thought I had overlooked something. Feb 5, 2020 at 12:49

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